Bordet, Jules-Jean-Baptiste-Vincent (bawr DAY) (1870-1961), a Belgian bacteriologist, was an expert in bacteriology, immunology, and serology and a pioneer in the field of immunity. For his work. Bordet won the 1919 Nobel Prize in physiology or medicine.

When he was 16, Bordet enrolled in the Free University of Brussels. He received his M.D. degree in 1892. Bordet had begun his research studies in medical school, and in 1892, he also published his first paper. In 1894, he received a scholarship from the Belgian government to work at the Pasteur Institute in Paris.

In his investigation of bacteriolysis, the destruction of the cell wall of bacteria, Bordet discovered that it was caused by the action of two substances in blood serum complement and antibody. This finding led to diagnostic tests to detect antibodies in the blood that are found in diseases such as typhoid fever and syphilis. Bordet also identified the bacterium responsible for whooping cough and studied blood coagulation. For his work in immunology, Bordet was awarded the 1919 Nobel Prize in physiology or medicine.

In 1901, at age 31, Bordet was appointed director of the newly founded Pasteur Institute of Brussels. He remained there until he retired in 1940. From 1907 to 1935, Bordet also served as professor of bacteriology at the Free University of Brussels.

Throughout much of his career, Bordet divided his time between his research and his administrative duties at the Pasteur Institute. The German occupation of Belgium during World War I (1914-1918) halted Bordet's research work, and he turned to writing. A book that he published in 1920 became a standard in immunology.

In 1899, Bordet married Marthe Levoz. The couple had two daughters and one son. When Bordet retired, his son, Paul, succeeded to his father's positions at the Pasteur Institute and the Free University of Brussels.